重点讲解：
1. all the time
一直；始终；
eg. Psychiatrists face this painful dilemma all the time.
精神科医生无时无刻都面临这样痛苦的困境。
eg. I've kept on thinking about that all the time.
我一直惦记着这件事。
2. used to do sth.
过去常常；过去曾做某事；
eg. Office farewells used to be special occasions.
办公室欢送会曾经是个特别时刻。
eg. They used to buy ten kilos of beef in one lump.
他们过去常买10公斤重的整块牛肉。
3. all together
一起；总共；
eg. It has received 40 applications and anticipates a couple of hundred all together.
它已经接到了40份申请，并且预计总共会收到数百份申请。
eg. All together, there were fifteen people present.
总共有十五人出席。
